Indiana Code Title 8. Utilities and Transportation § 8-22-3-28

Sec. 28.  (a) The acquisition, establishment, construction, improvement, equipment, maintenance, control, and operation of airports and landing fields for aircraft under this chapter is a governmental function of general public necessity and benefit, and is for the use and general welfare of all the people of Indiana, as well as of the people residing in the district.

(b) Notwithstanding any other statute, the leasehold estate of any lessee created pursuant to a lease by the board of its aviation related property or facilities, together with any permanent structure erected on the property by the lessee is exempt from property taxation.

(c) This subsection applies to property, facilities, or permanent structures leased by the board of an airport authority established for a county containing a consolidated city.  Notwithstanding subsection (a), any property, facilities, or permanent structures subject to a lease entered into or renewed after July 1, 1995, is not entitled to a property tax exemption if the property, facility, or structure is not used for aviation related purposes.